Principles of Anatomy and Physiology
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1 Principles of Anatomy and Physiology 14 th Edition CHAPTER 15 The Autonomic Nervous System Comparison of Somatic and Autonomic Nervous Systems The somatic nervous system includes both sensory and motor neurons. Sensory neurons are related to touch, pain, temperature, and proprioception (sense of self position), sight, hearing, taste, smell and equilibrium. Motor neurons innervate skeletal muscles. The autonomic nervous system receives input from sensory receptors located in organs, blood vessels, muscles and the nervous system. Comparison of Somatic and Autonomic Nervous Systems The axon of a single, myelinated somatic motor neuron extends from the central nervous system to the skeletal muscle fiber it innervates. 1
2 Comparison of Somatic and Autonomic Nervous Systems Most autonomic motor pathways consist of two motor neurons in series. The first (preganglionic neuron) has its cell body in the central nervous system. The axon extends to an autonomic ganglion. The second (postganglionic neuron) has its unmyelinated axon extending from the ganglion to the effector (smooth muscle, cardiac muscle, or gland). Comparison of Somatic and Autonomic Nervous Systems Comparison of Somatic and Autonomic Nervous Systems The autonomic nervous system is divided into two divisions: The sympathetic nervous system is often referred to as the fight-orflight division because its stimulation leads to increased alertness and metabolism to be ready for an emergency. The parasympathetic nervous system is referred to as the rest-anddigest division as its stimulation slows down most body activity. 2
3 Comparison of Somatic and Autonomic Nervous Systems Each division of the autonomic nervous system has two motor neurons: The preganglionic (cell body in the brain or spinal cord) and the postganglionic (cell body and dendrites located in an autonomic ganglion where it synapses with preganglionic axons). In the sympathetic division, the cell bodies of preganglionic neurons are in the lateral horns of the gray matter in the 12 thoracic and first 2 or 3 lumbar segments. 3
4 Anatomy of Autonomic Motor In the parasympathetic division, cell bodies of the preganglionic neurons are in the nuclei of four cranial nerves (III, VII, IX and X) in the brain stem and in the lateral gray matter of sacral segments 2 4 of the spinal cord. Anatomy of Autonomic Motor 4
5 Anatomy of Autonomic Motor There are two types of autonomic ganglia: sympathetic and parasympathetic. Sympathetic ganglia are sites of synapses between sympathetic preganglionic and postganglionic neurons. There are 2 major types of sympathetic ganglia: Sympathetic trunk ganglia (lie in a vertical row on either side of the vertebral column) and prevertebral ganglia (lie anterior to the vertebral column and close to the large abdominal arteries). After axons of sympathetic preganglionic neurons enter sympathetic trunk ganglia, they may connect with postganglionic neurons in one of 4 ways. 1. An axon may synapse with postganglionic neurons in the first ganglion it reaches. 2. An axon may ascend or descend to a higher or lower ganglion before synapsing with postganglionic neurons. 3. An axon may continue, without synapsing, through the sympathetic trunk ganglion to end at a prevertebral ganglion and synapse with postganglionic neurons. 4. An axon may also pass, without synapsing, through the sympathetic trunk ganglion and a prevertebral ganglion and then extend to the adrenal medullae. Anatomy of Autonomic Motor 5
6 The abdomen and pelvis also contain major autonomic plexuses which are often named after the artery along which they are distributed. These include the celiac (solar) plexus, the superior mesenteric plexus, the inferior mesenteric plexus, the renal plexus and the hypogastric plexus. Anatomy of Autonomic Motor Cell bodies of the sympathetic preganglionic neurons are part of the lateral gray horns of all thoracic segments and of the first two lumbar segments of the spinal cord. The paired sympathetic trunk ganglia are anterior and lateral to the vertebral column. Usually, there are 2 cervical, 11 or 12 thoracic, 4 or 5 lumbar, 4 or 5 sacral sympathetic trunk ganglia and 1 coccygeal ganglion. 6
7 Cell bodies of the parasympathetic preganglionic neurons are located in nuclei in the brain stem and in the lateral gray matter of the 2nd through 4th sacral segments of the spinal cord. There is a cranial parasympathetic outflow that extends from the brain stem in 4 cranial nerves. The sacral parasympathetic outflow extends from the 2nd through 4th sacral spinal nerves. Anatomy of Autonomic Motor Anatomy of Atonomic Motor Anatomy Overview: Nervous System: Organization of the ANS You must be connected to the Internet and in Slideshow Mode to run this animation. 7
8 ANS Neurotransmitters and Receptors Based on the neurotransmitter they produce and release, autonomic neurons are considered as either cholinergic or adrenergic. Cholinergic neurons release the neurotransmitter acetylcholine, while adrenergic neurons release norepinephrine (noradrenalin). Cholinergic receptors include nicotinic receptors and muscarinic receptors. ANS Neurotransmitters and Receptors 8
9 In general, the sympathetic and parasympathetic divisions of the autonomic nervous system are antagonistic to each other. 9
10 10
11 Integration and Control of Autonomic Functions Functions such as heart rate and force of ventricular contraction, blood pressure and blood vessel diameter are controlled by autonomic reflexes that occur when nerve impulses pass through an autonomic reflex arc. The reflex arc is composed of a receptor, a sensory neuron, an integrating center, motor neurons and an effector. The Nervous System and Homeostasis The nervous system is associated with virtually all functions of the body. It is intimately involved in maintaining homeostasis throughout the body. The Nervous System and Homeostasis 11
12 End of Chapter 15 Copyright 2014 John Wiley & Sons, Inc. All rights reserved. Reproduction or translation of this work beyond that permitted in section 117 of the 1976 United States Copyright Act without express permission of the copyright owner is unlawful. Request for further information should be addressed to the Permission Department, John Wiley & Sons, Inc. The purchaser may make back-up copies for his/her own use only and not for distribution or resale. The Publisher assumes no responsibility for errors, omissions, or damages caused by the use of these programs or from the use of the information herein. 12
Chapter 15: The Autonomic Nervous System. Copyright 2009, John Wiley & Sons, Inc.
Chapter 15: The Autonomic Nervous System Comparison of Somatic and Autonomic Nervous Systems Comparison of Somatic and Autonomic Nervous Systems Anatomy of Autonomic Motor Pathways Preganglionic neuron
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